crust is broken up into a series of more-or-less rigid plates that slide around due to motion of material in the mantle below.  Although the speeds of these plates vary somewhat, they are typically about 5.2 cm/ycm/y. Assume that this rate remains constant over time. a) If you and your neighbor live on opposite sides of a plate boundary at which one plate is moving northward at 5.2 cm/ycm/y with respect to the other

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Density of Solids

The density of a substance refers to how much matter is present in a given amount of space. It is expressed as the ratio of the mass of the substance to its volume.